.site-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
}

.site-brand {
  display: grid;
  gap: 0.35rem;
}

.site-kicker {
  color: rgba(255, 255, 255, 0.72);
  font-size: var(--font-size-small);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.site-header-right {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-nav a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  border-color: currentColor;
}

.site-user {
  color: var(--color-text-inverted);
  font-size: var(--font-size-small);
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
}

.settings-menu {
  position: relative;
}

.settings-menu summary {
  min-height: 2.2rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background-color: rgba(255, 255, 255, 0.06);
  color: var(--color-text-inverted);
  cursor: pointer;
  list-style: none;
}

.settings-menu summary::-webkit-details-marker {
  display: none;
}

.settings-menu summary::after {
  content: "";
  width: 0.45rem;
  height: 0.45rem;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  transform: rotate(45deg) translateY(-0.12rem);
}

.settings-menu[open] summary::after {
  transform: rotate(225deg) translateY(-0.12rem);
}

.settings-panel {
  position: absolute;
  top: calc(100% + 0.6rem);
  right: 0;
  z-index: 10;
  min-width: 220px;
  display: grid;
  gap: 0.8rem;
  padding: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background-color: var(--color-background-card);
  color: var(--color-text);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.18);
}

.settings-panel .site-user {
  color: var(--color-text);
  font-weight: var(--font-weight-medium);
}

.settings-panel button {
  min-height: 2.2rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  padding: 0.4rem 0.75rem;
  background-color: var(--color-background-page);
  color: var(--color-text);
  font: inherit;
  cursor: pointer;
}

.settings-panel button:hover {
  border-color: var(--color-accent);
}

.settings-link {
  min-height: 2.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  padding: 0.4rem 0.75rem;
  background-color: var(--color-background-page);
  color: var(--color-text);
  text-decoration: none;
}

.settings-link:hover {
  border-color: var(--color-accent);
  color: var(--color-text);
}

main.page-shell {
  max-width: 1160px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(250px, 0.9fr);
  gap: 1.5rem;
  align-items: start;
}

main.todo-shell {
  max-width: 1280px;
  grid-template-columns: minmax(0, 1fr);
}

.page-main,
.page-sidebar {
  display: grid;
  gap: 1.2rem;
  align-content: start;
}

.sidebar-card h2 {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

.sidebar-card p:last-child {
  margin-bottom: 0;
}

.link-stack {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.link-stack li {
  margin: 0;
}

.meta-list {
  display: grid;
  gap: 0.75rem;
}

.meta-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.meta-row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.detail-block {
  padding: 1rem;
  background-color: var(--color-background-subtle);
  border: 1px solid var(--color-border);
  border-radius: 12px;
}

.detail-block strong {
  display: block;
  margin-bottom: 0.5rem;
}

.detail-block p {
  margin-bottom: 0;
}
.dark-mode-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  justify-content: space-between;
  position: relative;
  width: 100%;
  color: inherit;
  font-size: var(--font-size-small);
  cursor: pointer;
}

.dark-mode-toggle input {
  position: absolute;
  width: 1px;
  height: 1px;
  min-height: 1px;
  margin: 0;
  padding: 0;
  border: 0;
  opacity: 0;
}

.theme-switch-track {
  width: 2.25rem;
  height: 1.25rem;
  order: 2;
  flex: 0 0 auto;
  position: relative;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background-color: var(--color-background-page);
  transition:
    background-color 160ms ease,
    border-color 160ms ease;
}

.theme-switch-track::after {
  content: "";
  position: absolute;
  top: 0.16rem;
  left: 0.16rem;
  width: 0.82rem;
  height: 0.82rem;
  border-radius: 999px;
  background-color: var(--color-text);
  transition: transform 160ms ease;
}

.dark-mode-toggle input:checked + .theme-switch-track {
  border-color: var(--color-accent);
  background-color: var(--color-accent);
}

.dark-mode-toggle input:checked + .theme-switch-track::after {
  background-color: var(--color-background-card);
  transform: translateX(1rem);
}

.dark-mode-toggle input:focus-visible + .theme-switch-track {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.theme-switch-text {
  order: 1;
}
@media (max-width: 860px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-header-right {
    width: 100%;
    justify-content: space-between;
  }

  main.page-shell {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  main.page-shell {
    padding: 1.5rem 1rem 3rem;
  }

  .detail-grid {
    grid-template-columns: 1fr;
  }
}